<template>
  <div class="upload-box">
    <el-upload
        action="#"
        :id="uuid"
        :class="['upload', self_disabled ? 'disabled' : '', drag ? 'no-border' : '']"
        :multiple="false"
        :disabled="self_disabled"
        :show-file-list="false"
        :http-request="handleHttpUpload"
        :before-upload="beforeUpload"
        :on-success="uploadSuccess"
        :on-error="uploadError"
        :drag="drag"
        :accept="fileType.join(',')"
    >
      <template v-if="imageUrl">
        <!-- 如果返回的是OSS 地址则不需要增加 baseURL -->
        <img :src="imageUrl.includes('http') ? imageUrl : baseURL + imageUrl" class="upload-image"/>
        <div class="upload-handle" @click.stop>
          <div class="handle-icon" @click="editImg" v-if="!self_disabled">
            <el-icon :size="props.iconSize">
              <Edit/>
            </el-icon>
            <span v-if="!props.iconSize">{{ $t('common.editBtn') }}</span>
          </div>
          <div class="handle-icon" @click="imgViewVisible = true">
            <el-icon :size="props.iconSize">
              <ZoomIn/>
            </el-icon>
            <span v-if="!props.iconSize">{{ $t('common.viewBtn') }}</span>
          </div>
          <div class="handle-icon" @click="deleteImg" v-if="!self_disabled">
            <el-icon :size="props.iconSize">
              <Delete/>
            </el-icon>
            <span v-if="!props.iconSize">{{ $t('common.delBtn') }}</span>
          </div>
        </div>
      </template>
      <template v-else>
        <div class="upload-empty">
          <slot name="empty">
            <el-icon>
              <Plus/>
            </el-icon>
            <!-- <span>请上传图片</span> -->
          </slot>
        </div>
      </template>
    </el-upload>
    <div class="el-upload__tip">
      <slot name="tip"></slot>
    </div>
    <el-image-viewer
        :teleported="true"
        v-if="imgViewVisible"
        @close="imgViewVisible = false"
        :url-list="[imageUrl.includes('http') ? imageUrl : baseURL + imageUrl]"
    />
  </div>
</template>

<script setup lang="ts" name="UploadImg">
import {computed, inject, ref} from 'vue';
import type {UploadProps, UploadRequestOptions} from 'element-plus';
import {ElNotification, formContextKey, formItemContextKey} from 'element-plus';
import {generateUUID} from '/@/utils/other';
import request from '/@/utils/request';

interface UploadFileProps {
  imageUrl?: string; // 图片地址 ==> 必传
  uploadFileUrl?: string; // 上传图片的 api 方法，一般项目上传都是同一个 api 方法，在组件里直接引入即可 ==> 非必传
  drag?: boolean; // 是否支持拖拽上传 ==> 非必传（默认为 true）
  disabled?: boolean; // 是否禁用上传组件 ==> 非必传（默认为 false）
  fileSize?: number; // 图片大小限制 ==> 非必传（默认为 5M）
  fileType?: File.ImageMimeType[]; // 图片类型限制 ==> 非必传（默认为 ["image/jpeg", "image/png", "image/gif"]）
  height?: string; // 组件高度 ==> 非必传（默认为 150px）
  width?: string; // 组件宽度 ==> 非必传（默认为 150px）
  borderRadius?: string; // 组件边框圆角 ==> 非必传（默认为 8px）
  iconSize?: number;
  dir?: string; // 文件目录
}

// 接受父组件参数
const props = withDefaults(defineProps<UploadFileProps>(), {
  imageUrl: '',
  uploadFileUrl: '/admin/sys-file/upload',
  drag: true,
  disabled: false,
  fileSize: 5,
  fileType: () => ['image/jpeg', 'image/png', 'image/gif'],
  height: '150px',
  width: '150px',
  borderRadius: '8px',
  dir: ''
});

// 生成组件唯一id
const uuid = ref('id-' + generateUUID());

// 查看图片
const imgViewVisible = ref(false);
// 获取 el-form 组件上下文
const formContext = inject(formContextKey, void 0);
// 获取 el-form-item 组件上下文
const formItemContext = inject(formItemContextKey, void 0);
// 判断是否禁用上传和删除
const self_disabled = computed(() => {
  return props.disabled || formContext?.disabled;
});

/**
 * @description 图片上传
 * @param options upload 所有配置项
 * */
interface UploadEmits {
  (e: 'update:imageUrl', value: string): void;
}

const emit = defineEmits<UploadEmits>();
const handleHttpUpload = async (options: UploadRequestOptions) => {
  let formData = new FormData();
  formData.append('file', options.file);
  formData.append('dir', props.dir);
  try {
    const {data} = await request({
      url: props.uploadFileUrl,
      method: 'post',
      headers: {
        'Content-Type': 'multipart/form-data',
      },
      data: formData,
    });
    emit('update:imageUrl', data.url);
    // 调用 el-form 内部的校验方法（可自动校验）
    formItemContext?.prop && formContext?.validateField([formItemContext.prop as string]);
  } catch (error) {
    options.onError(error as any);
  }
};

/**
 * @description 删除图片
 * */
const deleteImg = () => {
  emit('update:imageUrl', '');
};

/**
 * @description 编辑图片
 * */
const editImg = () => {
  const dom = document.querySelector(`#${uuid.value} .el-upload__input`);
  dom && dom.dispatchEvent(new MouseEvent('click'));
};

/**
 * @description 文件上传之前判断
 * @param rawFile 选择的文件
 * */
const beforeUpload: UploadProps['beforeUpload'] = (rawFile) => {
  const imgSize = rawFile.size / 1024 / 1024 < props.fileSize;
  const imgType = props.fileType.includes(rawFile.type as File.ImageMimeType);
  if (!imgType)
    ElNotification({
      title: '温馨提示',
      message: '上传图片不符合所需的格式！',
      type: 'warning',
    });
  if (!imgSize)
    setTimeout(() => {
      ElNotification({
        title: '温馨提示',
        message: `上传图片大小不能超过 ${props.fileSize}M！`,
        type: 'warning',
      });
    }, 0);
  return imgType && imgSize;
};

/**
 * @description 图片上传成功
 * */
const uploadSuccess = () => {
  ElNotification({
    title: '温馨提示',
    message: '图片上传成功！',
    type: 'success',
  });
};

/**
 * @description 图片上传错误
 * */
const uploadError = () => {
  ElNotification({
    title: '温馨提示',
    message: '图片上传失败，请您重新上传！',
    type: 'error',
  });
};
</script>
<style scoped lang="scss">
.is-error {
  .upload {
    :deep(.el-upload),
    :deep(.el-upload-dragger) {
      border: 1px dashed var(--el-color-danger) !important;

      &:hover {
        border-color: var(--el-color-primary) !important;
      }
    }
  }
}

:deep(.disabled) {
  .el-upload,
  .el-upload-dragger {
    cursor: not-allowed !important;
    background: var(--el-disabled-bg-color);
    border: 1px dashed var(--el-border-color-darker) !important;

    &:hover {
      border: 1px dashed var(--el-border-color-darker) !important;
    }
  }
}

.upload-box {
  .no-border {
    :deep(.el-upload) {
      border: none !important;
    }
  }

  :deep(.upload) {
    .el-upload {
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
      width: v-bind(width);
      height: v-bind(height);
      overflow: hidden;
      border: 1px dashed var(--el-border-color-darker);
      border-radius: v-bind(borderRadius);
      transition: var(--el-transition-duration-fast);

      &:hover {
        border-color: var(--el-color-primary);

        .upload-handle {
          opacity: 1;
        }
      }

      .el-upload-dragger {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 100%;
        height: 100%;
        padding: 0;
        overflow: hidden;
        background-color: transparent;
        border: 1px dashed var(--el-border-color-darker);
        border-radius: v-bind(borderRadius);

        &:hover {
          border: 1px dashed var(--el-color-primary);
        }
      }

      .el-upload-dragger.is-dragover {
        background-color: var(--el-color-primary-light-9);
        border: 2px dashed var(--el-color-primary) !important;
      }

      .upload-image {
        width: 100%;
        height: 100%;
        object-fit: contain;
      }

      .upload-empty {
        position: relative;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        font-size: 12px;
        line-height: 30px;
        color: var(--el-color-info);

        .el-icon {
          font-size: 28px;
          color: var(--el-text-color-secondary);
        }
      }

      .upload-handle {
        position: absolute;
        top: 0;
        right: 0;
        box-sizing: border-box;
        display: flex;
        align-items: center;
        justify-content: center;
        width: 100%;
        height: 100%;
        cursor: pointer;
        background: rgb(0 0 0 / 60%);
        opacity: 0;
        transition: var(--el-transition-duration-fast);

        .handle-icon {
          display: flex;
          flex-direction: column;
          align-items: center;
          justify-content: center;
          padding: 0 6%;
          color: aliceblue;

          .el-icon {
            margin-bottom: 40%;
            font-size: 130%;
            line-height: 130%;
          }

          span {
            font-size: 85%;
            line-height: 85%;
          }
        }
      }
    }
  }

  .el-upload__tip {
    line-height: 18px;
    text-align: center;
  }
}
</style>
